I was surprised by this as well, and then that reminded me BF3 has released DLC already. It's like everyone but Bethesda is doing it nowadays; I can hardly buy an indie game without some $4 pack coming out for it a couple months later.
BF3 had B2K to promote their LE and increase pre-orders and for many that was the selling point of Battlefield 3 because DICE's recent maps in recent games have been horrible so how can they ruin maps they just remake? kinda hard even for DICE
I haven't bought any game that charges for DLC (with more then just skins) within a month of release, couple months later yes but 1 month no.
BGS also stated they are not planning on doing mini DLC's as they did with Fallout 3 they are releasing bigger ones such as Shivering isles supposedly that would take more then a month and on top of that Skyrim currently isn't exactly excellent in the bugs department/optimization/glitches/etc department.